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#!/usr/bin/python
#
# Read ASN.1/PEM X.509 certificates on stdin, parse each into plain text,
# then build substrate from it
#
from pyasn1.codec.der import decoder, encoder
from pyasn1_modules import rfc2459, pem
import sys
if len(sys.argv) != 1:
print("""Usage:
$ cat CACertificate.pem | %s
$ cat userCertificate.pem | %s""" % (sys.argv[0], sys.argv[0]))
sys.exit(-1)
certType = rfc2459.Certificate()
certCnt = 0
while 1:
idx, substrate = pem.readPemBlocksFromFile(
sys.stdin, ('-----BEGIN CERTIFICATE-----',
'-----END CERTIFICATE-----')
)
if not substrate:
break
cert, rest = decoder.decode(substrate, asn1Spec=certType)
if rest: substrate = substrate[:-len(rest)]
print(cert.prettyPrint())
assert encoder.encode(cert, defMode=False) == substrate or \
encoder.encode(cert, defMode=True) == substrate, \
'cert recode fails'
certCnt = certCnt + 1
print('*** %s PEM cert(s) de/serialized' % certCnt)
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